96-97 / 973
Hybrid applications of IEC61511 – Laurie Blackmore
A common feature of all these hybrid schemes:
SIS is larger and more complex than an IEC61511 design based
on SIF‘s at SIL1+
For a typical offshore production facility:
Scheme 1 & 2 – Maybe 10% bigger than just API and
maybe 3 to 4 times bigger than IEC61511
Scheme 3 – Maybe 30% bigger than just API and
maybe 4 to 5 times bigger than IEC61511
16
Size and Complexity